Porsche 911 - Manual (Page 23)

· 48 ·
911 Carrera S with sports exhaust
Air intake system.
All models have a two-stage
resonance intake system, which
uses the vibration of the air
as it passes through the intake
manifold to increase the intake
volume. The system can adjust
to engine speed.
Benefits of this include higher
torque at low engine speeds
and a flatter torque curve.
The entire intake system is made
from lightweight plastic. The
air-filter housing of the 3.8-litre
engine has a variable geometry
that brings added character to
the engine sound which
becomes much more
aggressive at higher rpm.
· 49 ·
The new 911 | Engine
911 Carrera S exhaust system
Exhaust system.
The stainless steel exhaust system
comprises two independent
and separate exhaust tracts. Its
catalytic converters are highly
temperature-resistant and heat up
rapidly for effective emissions
reduction.
Thanks to advances in emissions
technology, they are able to meet
strict emission standards, such
as EU5 in Europe and LEV II in
the USA.
Using stereo lambda control,
two sensors continuously monitor
the exhaust gas composition
for each exhaust tract. A further
sensor monitors the efficiency
of the catalytic converters.
In addition, a sports exhaust
system (p. 48) is available as an
option. This can be activated as
desired using a button on the
centre console. If fitted in con-
junction with the optional Sport
Chrono Package Plus (p. 74),
the sports exhaust system is
activated automatically when
‘Sport’ mode is selected.